Tuning the response of YBCO microwave resonators by heavy-ion patterned micro-channels
Tuning the response of YBCO microwave resonators by heavy-ion patterned micro-channels
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DOI：
10.1088/0953-2048/25/11/115007
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发表时间：
2012-11-01
影响因子：
3.6
通讯作者：
Gozzelino, L.
中科院分区：
文献类型：
--
作者：
Ghigo, G.;Laviano, F.;Gozzelino, L.
采用高注量快重离子微准直辐照在YBa_2Cu_3O_（7-x）（YBCO）共面微波谐振腔中刻蚀出微米级宽度的通道。谐振器的响应作为温度，磁场和输入功率的函数，以及磁光成像被用来表征这种微通道的属性。提出的微波方法来表征的通道的尺寸从1/3200到1/178的波长是基于基本和第一谐波谐振模式之间的比较。正如预期的那样，由于高辐照能量密度，更高的穿透深度，更高的微波电阻率和更低的非线性thresholds. In这种配置中，它表明，微通道可以被驱动到一个高耗散，非线性regime，而其余的谐振器仍然保持在一个线性响应。通过施加外部磁场测试了微通道相对于生长态YBCO的较高响应度，表明当适当偏置时，局部施加的外部控制信号可以调谐谐振器的响应。这些结果在高温超导传感器领域的可能影响进行了讨论。
Channels with micron-size width have been carved in YBa2Cu3O7-x (YBCO) coplanar microwave resonators by micro-collimated swift heavy-ion irradiation at high fluences. The response of the resonators as a function of temperature, magnetic field and input power as well as magneto-optical imaging was used to characterize the properties of such micro-channels. The microwave method proposed to characterize the channels-with dimensions from 1/3200 to 1/178 of the wavelength-is based on the comparison between the fundamental and the first harmonic resonant modes. As expected due to the high irradiation fluence, higher penetration depth, higher microwave resistivity and lower nonlinearity thresholds have been found. In this configuration, it is shown that the micro-channels can be driven into a highly dissipative, nonlinear regime while the rest of the resonator still persists in a linear response. The higher responsivity of the micro-channels with respect to the as-grown YBCO was tested by applying an external magnetic field, showing that a locally applied external control signal can tune the response of the resonators, when properly biased. The possible impact of these results in the field of high temperature superconductor based sensors is discussed.